Ordinary Language Philosophy (also known as Linguistic Philosophy or Natural Language Philosophy) is a 20th Century philosophical school that approaches traditional philosophical problems as rooted in misunderstandings philosophers develop by forgetting what words actually mean in a language, and taking them in abstraction and out of context.

Some see Ordinary Language Philosophy as a complete break with, and a reaction against, the Analytic Philosophy movement it grew out of; others see it as just an extension of, or another stage of, the Analytic tradition. Either way, it became a dominant philosophic school between 1930 and 1970, and arguably remains an important force in present-day philosophy.

Ordinary Language Analysis typically involves eschewing philosophical "theories" in favour of close attention to the details of the use of non-technical everyday "ordinary" language. Thus, it argues, the contemplation of language in its normal use, can "dissolve" the appearance of philosophical problems, rather than attempting to solve them. For more details, see the section on the doctrine of Ordinary Language Philosophy.

Early Analytic Philosophy tended to dismiss language as being of little philosophical significance, and ordinary language as just being too confused to help solve metaphysical and epistemological problems. Analytic philosophers such as the young Ludwig Wittgenstein, Bertrand Russell, W.V.O. Quine and Rudolp Carnap (1891 - 1970), all attempted to improve upon natural language using the resources of modern Logic, in an attempt to make it more unambiguous and to accurately represent the world, in order to better deal with the questions of philosophy ("ideal language" analysis).

However, Wittgenstein's later unpublished work in the 1930's began to centre around the idea that maybe there is nothing wrong with ordinary language as it stands, and that perhaps many traditional philosophical problems were only illusions brought on by misunderstandings about language and related subjects.

Although heavily influenced by Wittgenstein and his students at Cambridge, Ordinary Language Philosophy largely flourished and developed at Oxford in the 1940s, under Gilbert Ryle, J. L. Austin (1911 - 1960), Peter Strawson (1919 - 2006), John Wisdom (1904 - 1993) and others, and was quite widespread for a time before declining rapidly in popularity in the late 1960s and early 1970s.